<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>游戏房间</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/game_room.css">
</head>
<body>
    <div class="nav">网络五子棋对战游戏</div>
    <div class="container">
        <div id="chess_area">
            <!-- 棋盘区域, 需要基于 canvas 进行实现 -->
            <canvas id="chess" width="450px" height="450px"></canvas>
            <!-- 显示区域 -->
            <div id="screen"> 等待玩家连接中... </div>
        </div>
        <div id="chat_area" width="400px" height="300px">
            <div id="chat_show">
                <p id="self_msg">你好！</p></br>
                <p id="peer_msg">你好！</p></br>
            </div>
            <div id="msg_show">
                <input type="text" id="chat_input">
                <button id="chat_button">发送</button>
            </div>
        </div>
    </div>
    <script>
        let chessBoard = [];
        let BOARD_ROW_AND_COL = 15;
        let chess = document.getElementById('chess');
        //获取chess控件区域2d画布
        let context = chess.getContext('2d');

        var ws_url="ws://"+location.host+"/room";//url
        var ws_hdl=new WebSocket(ws_url);//websocket连接操作句柄

        //房间信息
        var room_info=null;
        //当前是否轮到我方走棋
        var is_me;

        function initGame() {
            initBoard();
            // 背景图片
            let logo = new Image();
            logo.src = "image/sky.jpeg";
            logo.onload = function () {
                // 绘制图片
                context.drawImage(logo, 0, 0, 450, 450);
                // 绘制棋盘
                drawChessBoard();
            }
        }
        function initBoard() {
            for (let i = 0; i < BOARD_ROW_AND_COL; i++) {
                chessBoard[i] = [];
                for (let j = 0; j < BOARD_ROW_AND_COL; j++) {
                    chessBoard[i][j] = 0;
                }
            }
        }
        // 绘制棋盘网格线
        function drawChessBoard() {
            context.strokeStyle = "#BFBFBF";
            for (let i = 0; i < BOARD_ROW_AND_COL; i++) {
                //横向的线条
                context.moveTo(15 + i * 30, 15);
                context.lineTo(15 + i * 30, 430); 
                context.stroke();
                //纵向的线条
                context.moveTo(15, 15 + i * 30);
                context.lineTo(435, 15 + i * 30); 
                context.stroke();
            }
        }
        //绘制棋子
        function oneStep(i, j, isWhite) {
            if (i < 0 || j < 0) return;
            context.beginPath();
            context.arc(15 + i * 30, 15 + j * 30, 13, 0, 2 * Math.PI);
            context.closePath();
            //createLinearGradient() 方法创建放射状/圆形渐变对象
            var gradient = context.createRadialGradient(15 + i * 30 + 2, 15 + j * 30 - 2, 13, 15 + i * 30 + 2, 15 + j * 30 - 2, 0);
            // 区分黑白子
            if (!isWhite) {
                gradient.addColorStop(0, "#0A0A0A");
                gradient.addColorStop(1, "#636766");
            } else {
                gradient.addColorStop(0, "#D1D1D1");
                gradient.addColorStop(1, "#F9F9F9");
            }
            context.fillStyle = gradient;
            context.fill();
        }
        //棋盘区域的点击事件
        chess.onclick = function (e) {
            if(!is_me)
            {
                alert("等待对方走棋...");
                return;
            }
            let x = e.offsetX;
            let y = e.offsetY;
            // 注意, 横坐标是列, 纵坐标是行
            // 这里是为了让点击操作能够对应到网格线上
            let col = Math.floor(x / 30);
            let row = Math.floor(y / 30);
            if (chessBoard[row][col] != 0) {
                alert("当前位置已有棋子！");
                return;
            }
            //oneStep(col, row, true);
            //发送走棋请求
            send_chess(row,col);
        }
        //发送走棋请求
        function send_chess(r,c)
        {
            var chess_info={
                optype:"put_chess",
                room_id:room_info.room_id,
                uid:room_info.uid,
                row:r,
                col:c
            };
            ws_hdl.send(JSON.stringify(chess_info));
            console.log("send_chess："+JSON.stringify(chess_info));
        }

        
        //当前页面关闭时的回调,页面关闭立即断开连接
        window.onbeforeunload=function()
        {
            ws_hdl.close();
        }

        //设置回调函数
        ws_hdl.onopen=function()
        {
            console.log("房间建立成功！");
        }
        ws_hdl.onclose=function()
        {
            console.log("房间连接关闭！");
        }
        ws_hdl.onerror=function()
        {
            console.log("房间连接出错！");
        }
        //设置显示内容
        function set_screen(me)
        {
            var screen_div=document.getElementById("screen");
            if(me)
            {
                screen_div.innerHTML="轮到我方走棋";
            }
            else
            {
                screen_div.innerHTML="轮到对方走棋";
            }

        }
        ws_hdl.onmessage=function(evt)
        {
            console.log(JSON.stringify(evt.data));
            //initGame();
            //收到room_ready消息之后，对房间进行初始化
            //保存房间信息
            //初始化显示信息
            var info=JSON.parse(evt.data);
            console.log(JSON.stringify(info));
            if(info.optype=="room_ready")//准备房间
            {
                room_info=info;
                is_me=info.uid==room_info.white_id?true:false;
                //设置显示内容
                set_screen(is_me);
                //显示棋盘
                initGame();
            }
            else if(info.optype=="put_chess")//走棋
            {
                //走棋
                if(info.result==false)
                {
                    alert(info.reason);
                    return;
                }
                is_me=info.uid==room_info.uid?false:true;
                var is_white=info.uid==room_info.white_id?true:false;
                if(info.row!=-1&&info.col!=-1)
                {
                    //绘制棋子
                    oneStep(info.col,info.row,is_white);
                    //设置棋盘信息
                    chessBoard[info.row][info.col]=1;
                    set_screen(is_me);
                }
                //判断是否有胜者
                if(info.winner==0)
                {
                    return;
                }
                //有人胜利
                var screen_div=document.getElementById("screen");
                screen_div.innerHTML=info.reason;

                // alert(JSON.stringify(info.reason));

                // location.assign("/game_hall.html");
                
                //添加返回大厅按钮
                var chess_area_div=document.getElementById("chess_area");
                var button_div=document.createElement("div");
                button_div.innerHTML="返回游戏大厅";
                button_div.onclick=function()
                {
                    ws_hdl.close();
                    location.assign("/game_hall.html");
                }
                button_div.setAttribute("id","screen");
                //添加按钮到chess_area区域
                chess_area_div.appendChild(button_div);
            }
            else if(info.optype=="chat")//聊天
            {
                if(info.result==false)
                {
                    alert(info.reason);
                    return;
                }
                //正常收到消息
                var msg_div=document.createElement("p");//创建一个组件保存消息
                msg_div.innerHTML=info.message;//取出消息
                //给消息进行渲染
                if(info.uid==room_info.uid)//自己发的消息
                {
                    msg_div.setAttribute("id","self_msg");
                }
                else
                {
                    msg_div.setAttribute("id","peer_msg");
                }
                //创建一个换行组件
                var br_div=document.createElement("br");
                //获取聊天展示区
                var msg_show_div=document.getElementById("chat_show");
                //添加子控件
                msg_show_div.appendChild(msg_div);
                msg_show_div.appendChild(br_div);
                //清空聊天框
                document.getElementById("chat_input").value="";
            }
        }

        //给聊天框发送按钮添加点击事件
        var cb_div=document.getElementById("chat_button");
        cb_div.onclick=function()
        {
            //获取输入框信息，并组织成对应格式的消息，发送给服务器
            var msg={
                optype:"chat",
                room_id:room_info.room_id,
                uid:room_info.uid,
                message:document.getElementById("chat_input").value
            };
            ws_hdl.send(JSON.stringify(msg));
        }

    </script>

</body>
</html>